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I have a 94 XJ6, and one mechanic says it needs 3 lbs to recharge, and  another says 5lbs, who is right? how many cans does it take, or what must the preasure gauge show?

i have same car, factory sticker states, 2.5 lbs/+- 1.8 lbs, high pressure side, never over 300 lbs, w/ ac running.  aporte822@hotmail.com